Subdomain Lookup | Web-based subdomain scanner | WhoisXML API
Products APIs Data Feeds Web Tools Domain Research & Monitoring Enterprise Packages
WHOIS / WHOIS History
WHOIS / WHOIS History

Provide current and historical ownership information on domains / IPs. Identify all connections between domains, registrants, registrars, and DNS servers.

DNS / DNS History
DNS / DNS History

Look into all current and historical DNS / IP connections between domains and A, MX, NS, and other records. Monitor suspicious changes to DNS records.

IP Geolocation / IP Netblocks
IP Geolocation / IP Netblocks

Get detailed context on an IP address, including its user’s geolocation, time zone, connected domains, connection type, IP range, ASN, and other network ownership details.

Domain Research Suite (DRS)
Domain Research Suite (DRS)

Access our web-based solution to dig into and monitor all domain events of interest.

Domain Research Suite (DRS)
Domain Research Suite (DRS)

Get access to a web-based enterprise-grade solution to search and monitor domain registrations and ownership details for branded terms, fuzzy matches, registrants of interest, and more.

Research
Monitoring
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WhoisXML API Predictive Threat Intelligence
Predictive Threat Intelligence

Detect and block access to and from dangerous domain names before malicious actors can weaponize them. Contact us today for more information.

WhoisXML API Internet Infrastructure
Internet Infrastructure

Unlock integrated intelligence on Internet properties and their ownership, infrastructure, and other attributes.

Enterprise API Packages
Enterprise API Packages

Our complete set of domain, IP, and DNS intelligence available via API calls as an annual subscription with predictable pricing.

Security Intelligence (SI) Suite
Security Intelligence (SI) Suite

Offers complete access to WHOIS, IP, DNS, and subdomain data for product enrichment, threat hunting and more.

Multi-Level API User Administration Now Available - Manage individual API keys for team members in your organization.

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Subdomains Lookup: Instantly Identify the Subdomains of a Domain

Obtain a list of the subdomains under a given domain name and their corresponding first-seen and last-seen dates in one click. Test Subdomains Lookup now. Download our product sheet to learn more.

2.3 Billion+Subdomains
1 Million+Subdomains discovered daily
52,000+Satisfied customers
14+Years of data crawling

What is Subdomain Lookup?

Subdomain Lookup allows you to identify all subdomains associated with any given domain name. With the aid of a database that’s updated daily, increasing by more than 1 million subdomains daily, we provide the most comprehensive and up-to-date information on all subdomains related to a given domain name in a convenient and unified format.

Subdomains Lookup

Benefits

  • Based on up-to-date data

    All the subdomains that appear as search results come from a massive Subdomain Lookup database compiled through more than 10 years of data crawling and gets refreshed daily.

  • Readily available results

    Each lookup reveals a list of subdomains related to a domain of interest.

  • Subdomain checker with shareable findings

    Subdomains Lookup reports can be shared with colleagues instantly using custom URLs.

Our subdomain scanner tool lets you:

Enrich cybersecurity research

Enrich cybersecurity research

Attackers are known for using tons of subdomains to evade detection. Identify all the components of their infrastructure for more in-depth investigation results.

Identify dangling records

Subdomains left unused or forgotten are all too often left insufficiently protected. Make sure these haven’t been illegitimately modified for use in attacks.

Identify dangling records
Catch all possible attack culprits

Catch all possible attack culprits

Not all lists of indicators of compromise (IoCs) are exhaustive. Attackers may be using more subdomains than those identified as IoCs. Find all possible attack entry points to cover all your bases.

Gain much-needed competitive advantages

One way to get ahead of the competition is by staying toe-to-toe with business rivals. Their recently added subdomains can clue you into their up and coming product and service launches, as well as the business partners they might be working with.

Gain much-needed competitive advantages
Boost penetration testing efforts

Boost penetration testing efforts

Identify all your network’s weakest links by going deeper than the domain level. Consider your entire infrastructure so none of your systems are left exposed to threats or risks.